Electromagnetic fishing-tool.



G. N. WHITE;

ELECTROMAGNETIC FISHING TOOL. APPLICATION rnmn nno. 23. 1912.

- 1,094,106." Patented Apr. 21, 1914 2 sums-SHEET 1.

G. N. WHITE.

ELECTROMAGNETIC FISHING TOOL.

A'PPLIOATION FILED DBO. 23, 1912.

1,094,106, Patented Apr. 21, 191 1 2 SHEETS-SHEET 2.

To all whom it may concern:

UNITED STATES PATENT OFFICE.

CALVIN N. WHITE, OF MARICOPA, CALIFORNIA.

ELECTROMAGNETIC FISHING-TOOL.

Specification of Letters Patent. Patented Apr. 21,191&.

Application filed December 23, 1912. Serial No. 738,392.

to breakage of some portion of the string of tools used in the drillingoperation of the well. The operation of recovering such lost tools istedious and costly, due to the fact that the common form of fishingtools used for this purpose depend upon a mechanical manipulation of theportions of the fishing tool which engage the lost tools, and as suchmechanical operation takes place at a great distance under the ground,it is a matter of considerable work and skill to manipulate nent betterillustrate the construction of the same.

the same with any degree of success.

To overcome the defects of the tools in common use for this purpose, Ihave devised a fishing tool embodying a form ofelectric magnet which maybe loweredinto the well into contact with the lost tools, and the sameremoved from the well by means of the magnetic attraction of the fishingtool.

Another object of my invention is to produce an electro-magnetic fishingtool of simple form and con struction wherein means are provided forprotecting the electric winding from damage during the fishingoperation.

Referring to the drawings, which are for illustrative purposes only:Figure 1 is a vertical sectional view of a fishing tool embodying a formof my invention. Fig. 2 is a sectional view on line w -m Fig. 1. Fig. 3is a perspective view showing the compoparts of thefishing toolseparated, to

The fishing tool comprises a body member 1, preferably composed of softiron, which body member 1 has a head 2, the upper end of whichterminates in a threaded shank 3 which may be secured to the lower endof a series of rods or piping, notshown, such as is commonly used inwell construction.

The' body member 1 'is forged into the 'form' shown, having extendingdownwardly therefrom two cores 4-and 5, the inner faces 6 and 7 of thecores being fiat and the outer faces 8 and 9 of the respective coresbeing rounded, preferably concentric with the contour of the head 2.

10 and 11 designate windings for the respective cores 1 and 5, whichwindings are covered by insulating material 12 and 13, the windings 10and 11 being inclosed by a tubular shell 15, the upper end 16 of whichengages a threaded portion 17 of the head2.

18 designates a flat plate provided with openings '19 and 20 into whichopenings the lower ends 21 and 22 of the respective ,cores 1 and 5extend. The plate 18 is held against the lower end of the windings 10and 11 by means of a shoe 241 provided with a circular shoulder 25between which shoulder and'the lower end of the tubular shell 15 theplate 18 is tightly clamped, the upper end of the shoe 24 beinginteriorly threaded to engage the lower threaded end of the tubularshell 15. The tubular shell 15, the plate 18 and the shoe 24 arepreferably formed of brass and together form a casing or inclosure forthe winding of the respective cores.

26 and 27 designate insulated wires which extend from the windingsthrough a bore 28 upwardly through the head 2, the upper end of whichbore 28 is provided with a stuffing box 29. The lower ends 21 and 22 ofthe respective cores 4 and 5 extend below the lower edge of the shoe 2 1a sufiicient distance to permit the same to freely come into contactwith any object in the well before the shoe contacts with the same.

It is to be noted that the lower inner face of the shoe is rounded, asindicated at 30, to give a greater clearance around'the lower end of thecores 4 and 5.

The tool is operated in the following manner: The threaded upper end ofthe head 2 is secured to the lower end of the string of tools and thefishing tool is lowered into the well until the lower ends 21 and 22ofthe respective cores 4 and 5 come in contact with the article sought inthe well. A current of electricity is passed through the wires 26 and 27and through the respective windings 10 and 11 by means of which thecores 4 and 5 become magnetized. The cores 4 and 5 and the head 2constitute, in general, what is commonly termed a horseshoe magnet,which in the form shown and described is of sufficient power to lift thelost tool out of the well by raising the string of tools and ferred topermits the placing of the stufiing f box 29 within the exteriordiameter of the tool in such a position that the wires extendt-herebydiminishing the possibility of breakage of the electric connection ofthe winding.

adapted to engage said plate and hold the same against the lower end ofsaid shell.

2. An eleetro-inagnetic fishing tool comprising a body member, a pair ofcores formed integral with said body extending ,downwardly therefromsubstantially paring therefrom are prevented from coming into contactwith the casing of the well,

The tool as heretofore described constitutes in general form anapproximately cyl lindrical body of somewhat smaller diameter than thecasing of the well, the cylindrical shape of the tool making it bestadapted for operating the same through the casing of the well during thefishing operation.

It is also to be noted that thefo'rm of body member with the coresforged and made an integral part thereof, which 'ores have theparticular shape heretofore described, permits the winding of the coresand the inclosure of the same by the tubular shell in such a manner thatthe result of the said eonstruction is a compact form of tool of fewparts damage or breakage.

The openings 19 and 20 through the plate 18 are made so that the fitbetween the openings between the plates and'the cores is tight, and theplate 18 and the tubular shell 15 prevent passage of water or otherforeign material from the well to the Winding of the cores.

What l claim is 1. An electro-magnetic fishing tool comprising a bodymember, a pair of cores formed on said body member extending downwardlytherefrom, a winding on each core, means for insulating said windings, a

tubular shell secured to said body member extending downwardly(JlI'Cllltll tubular shell,

for each core to permit the ends of said cores over said windings, a

allel with each other, said cores having flat inner faces and curvedouter faces, a winding on each core. insulating means covering each ofsaid windings, a tubular shell threaded to engage the lower portion ofsaid head, a, circular plate against the lower end of said shell, saidplate having an opening tlnii-ethrough for each core to permit the endsofthe core to extend downwardly therethrough, a circular shoe threadedto the lower end of said shell. and a circular shoulder on said shoeadapted to engage said plate to hold saidplate against said shell.

3. An electromagnetic fishing tool comprising a body member having anopening extending therethrough, a stufiing box at the outer end of saidopening, a pair of cores formed integral with said body member ex- Itending downwardly therefrom substanof which there is a minimumpossibility of tially parallel with each other, said cores l l l l i anopening therethrongh for each core to faces, a winding on each core,wires from said winding extending through said opening in said body andsaid stulling box, a tubular shell threaded to engage the lower portionof said head, a circular plate against the lower end of said shell, saidplate having permit the ends of the core to extend downplate against thelower end of said said plate having an opening 1 to extend downwardlytherethrough, a eircular shoe secured to the lower end of said shell,and a circular shoulder on said shoe wardly therethrough, a circularshoe threaded to the lower end of said shell, and a circular shoulder onsaid shoe adapted to engage siiirlll plate to hold said plate againstsaid sie In testimony whereof, I have hereunto set my hand at Maricopa,Calif. this 4th day of Dec, 1912.

CALVIN N. VVHlTE.

lii presence of N. '1. Tumor, Roar. URotiizn'it.

